Fehlermeldung

Is it still worth learning javafx?

Thanka I try it tomorrow

This is because Oracle dropped support for JavaFX... I believe that occurred with Java 15 but it could have been earlier. So you are left with 2 options: #1 go to the website for Java FX and follow the instructions to set the VM options in Intellij to allow it to preload the JavaFX components needed to launch #2 or what I have been doing: first create a public static method in the Game2048 class, i called mine startProg() like this:

public static void startProg() {
   launch(new String[0]);
}

Next create a class in the program folder of the game and add a main() for it like this:

public class Start {
    public static void main(String[] args) {
        Game2048.startProg(args);
    }
}

Both the method name from step 1 and class name from step 2 are inconsequential and you can call them whatever you want. Just make sure that you are calling the created method in the main method. This works but you won't be able to publish the game like this.